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Microchip Technology 93AA66AT-I/ST
- Part No.:
- 93AA66AT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA66AT-I/ST.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,436
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Product details
Overview
93AA66AT-I/ST from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, Microwire-compatible 3-wire interface (CS, CLK, DI/DO), and industrial temperature range (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and >200 years data retention - used in embedded system configuration storage, sensor calibration memory, and firmware parameter backup.
For engineers reviewing the 93AA66AT-I/ST datasheet, 93AA66AT-I/ST pinout, 93AA66AT-I/ST application, or 93AA66AT-I/ST equivalent, key selection criteria include VCC range (1.8–5.5 V), 8-bit word size (no ORG pin), TSSOP-8 package compatibility, and support for sequential read and Ready/Busy polling via DO pin.
Technical Context
This device implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven instruction set (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS), and internal auto-erase-before-write logic. It uses CMOS technology with on-chip voltage detection (VPOR = 1.5 V) and supports clock frequencies up to 3 MHz at VCC ≥ 4.5 V.
Memory access relies on CS-active-high selection, rising-edge CLK synchronization, and bidirectional DI/DO with high-impedance control. The ORG pin is not present (NC) on 'A' versions like 93AA66AT-I/ST, fixing 8-bit operation and eliminating external configuration logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit), fixed x8 organization - no ORG pin required, simplifying PCB layout and firmware address mapping. |
| VCC Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters. |
| Endurance | 1,000,000 erase/write cycles - supports frequent field-updatable parameters in industrial controllers and IoT edge nodes. |
| Data Retention | >200 years at 25°C - ensures long-term reliability for unattended systems such as utility meters and medical devices. |
| Write Cycle Time | 6 ms typical (TWC) - defines minimum delay between write commands; impacts real-time logging throughput. |
| Interface Protocol | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - reduces pin count vs. SPI, compatible with legacy MCU peripherals. |
| Operating Temp | –40°C to +85°C (Industrial grade) - validated for use in factory automation, automotive body electronics, and outdoor equipment. |
Pinout & Package
93AA66AT-I/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, Pb-free Matte Tin finish. Pin 1 marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; controls Standby mode entry/exit. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; supports stop/resume mid-transfer; TCKH/TCKL minima vary with VCC. |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; tied to DO only with series resistor to avoid bus conflict. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires TCSL ≥250 ns before status polling. |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; must be low-impedance connection to minimize noise coupling. |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS/VCC per board design rules - no functional impact. |
| 7 (ORG) | Organization Select | No internal connection on 93AA66A devices - permanently configured for 8-bit operation; unused pin. |
| 8 (VCC) | Power Supply | Supplies core and I/O; includes on-chip POR circuit (1.5 V threshold); decoupling capacitor mandatory. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing control; internal state machine manages auto-erase-before-write, reducing firmware overhead. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; prevents partial writes and data corruption during power loss. |
| Power-On/Off Data Protection | VCC monitor disables writes below 1.5 V; prevents inadvertent writes during brown-out or startup transients. |
| Ready/Busy Status via DO | Enables non-blocking polling instead of fixed delays; improves system responsiveness and reduces CPU wait cycles. |
| Sequential Read Function | Allows continuous address incrementing while CS remains high - accelerates bulk read operations (e.g., config block fetch). |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with infrequent writes and long-term retention; accessed at system boot or calibration routine. Use Value: Eliminates need for external trim pots or OTP fuses; supports field recalibration and multi-sensor traceability. | Use Scenario: Holding user-configurable settings (baud rate, network ID, alarm thresholds) in HVAC controllers and smart thermostats. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to MCU GPIO or hardware Microwire peripheral; read at startup, written on menu save. Use Value: Enables persistent settings across power cycles without battery backup; leverages 1.8–5.5 V operation for mixed-voltage designs. |
| Firmware Parameter Backup | Automotive Body Control Module |
Use Scenario: Backing up runtime-modified firmware variables (e.g., motor wear counters, adaptive learning values) in motor drives and inverters. IC Role / Device Role / Timing Role: Low-power, high-endurance data logger; writes triggered by critical event or periodic sync; reads on cold boot. Use Value: Survives 1M+ cycles and >200-year retention - outlasts product lifetime; avoids FRAM cost premium. | Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive door modules. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced to 3.3 V CAN/LIN microcontroller; operates across –40°C to +85°C ambient. Use Value: Meets AEC-Q100 stress requirements via qualification testing; TSSOP-8 footprint fits space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66AT-I/ST | VCC range 2.5–5.5 V; same 512 × 8-bit organization, TSSOP-8 package, and pinout. | Lacks 1.8 V operation; unsuitable for ultra-low-voltage systems but offers tighter VIL/VIH thresholds. | Select when operating exclusively at ≥2.5 V and higher noise immunity is needed. |
| AT25040B-SSHL-T | SPI interface (4-wire), 512 × 8-bit, 1.8–5.5 V, SOIC-8; no Ready/Busy pin - relies on WIP flag polling. | Requires additional chip select line and different command set; lacks DO-based status signal. | Choose for SPI-native designs where firmware already supports Atmel's instruction set and timing model. |
Compared with 93LC66AT-I/ST, the 93AA66AT-I/ST enables 1.8 V operation and lower standby current, while the AT25040B-SSHL-T trades Microwire simplicity for broader SPI ecosystem compatibility but removes hardware-ready signaling.
Availability
93AA66AT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA66AT-I/ST includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX66 family was designed specifically for low-power, nonvolatile memory applications in space- and cost-constrained embedded systems, emphasizing Microwire compatibility, wide VCC range, and robust data integrity.
FAQ
What is the memory organization of the 93AA66AT-I/ST?
The 93AA66AT-I/ST is a 512 × 8-bit (4 Kbit) serial EEPROM with fixed x8 organization. Unlike 'C' variants, it has no ORG pin - the memory is permanently configured for byte-wide access, simplifying firmware development and eliminating external configuration logic.
Does the 93AA66AT-I/ST support 1.8 V operation?
Yes, the 93AA66AT-I/ST supports a VCC range of 1.8 V to 5.5 V, making it compatible with modern low-voltage microcontrollers and enabling direct interface without level-shifting circuitry - a key differentiator from the 93LC66A and 93C66A families.
How is Ready/Busy status monitored on the 93AA66AT-I/ST?
Ready/Busy status is reported on the DO pin: logic low indicates ongoing erase/write, logic high signals completion. To poll, CS must be brought high after ≥250 ns low time (TCSL). Issuing a Start bit then lowering CS clears the status flag.
What package type is used for the 93AA66AT-I/ST?
The 93AA66AT-I/ST is supplied in an 8-lead TSSOP (Thin Shrink Small Outline Package), designated 'ST' in Microchip's package code. It features 0.65 mm lead pitch, JEDEC MO-153 compliance, and Pb-free Matte Tin plating.
Is the ORG pin functional on the 93AA66AT-I/ST?
No - the ORG pin is not internally connected on 93AA66A devices like the 93AA66AT-I/ST. It is labeled 'NC' (No Connect) in the pin function table and must be left floating or tied to VSS/VCC per board design rules; it has no effect on operation.
93AA66AT-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93AA66AT-I/ST FAQ
1.How can I place an order for 93AA66AT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66AT-I/ST on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 93AA66AT-I/ST reliable?
The price and inventory of 93AA66AT-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA66AT-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA66AT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66AT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66AT-I/ST?
93AA66AT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66AT-I/ST order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 93AA66AT-I/ST?
For technical support, including 93AA66AT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66AT-I/ST requirements.
6.How does Aetrix verify that 93AA66AT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA66AT-I/ST products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 93AA66AT-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA66AT-I/ST?
All 93AA66AT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66AT-I/ST, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 93AA66AT-I/ST part is unused and in its original packaging.
Return procedure for 93AA66AT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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